Table 2
Improper fuel used
EngineSpark plug defective (worn) overheated
As cooling fins clogged, air does not pass well
Excessive deposits in combustion chamber
Use fuel with correct mixing ratio. Never use gasoline of poor quality.
Replace.
Clean fins.
Disassemble and remove carbon.
English
Ouput (engine speed) insufficient
Engine keeps running, but chain does not cut clean
Output (engine speed) sufficient
Firing function defective
Carburetor defective
Other troubles
Chain does not cut clean
Chain stops
(Clutch slips) Chain poorly
lubricated
Plug damaged or fouled
Combustion poor due to defective wiring
Air cleaner clogged
Compression insufficient (piston ring stuck or worn out)
Cylinder chromium plating peeled or worn out
Exhaust port clogged with carbon
Throttle is not fully open
Chain tension incorrect
Chain wrongly set
Depth incorrect
Chain saw pressed against tree too firmly
Clutch shoe worn out
No oil in tank
Oil delivery incorrect
Oil contaminated with dust
Oil viscosity inappropriate
Replace or clean.
Check wiring.
Readjust.
Refer to Table 1.
Clean as necessary.
Disassemble, check and replace if necessary.
Replace cylinder
Clean as necessary.
Readjust.
Adjust.
Set correctly.
Readjust.
Press lightly.
Replace.
Refill.
Adjust.
Rinse tank and fill with new oil..
Use oil with correct viscosity for sum- mer or winter.
WARNING 
DANGER
Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition spark by grounding spark plug near cylinder plug hole, otherwise serious personal injury may result.
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